/// <summary>
        /// Adds a new marker to goal distance rule to the rule list box, when the rule user controls fires the DataVaild event
        /// </summary>
        private void MarkerToGoalDistanceRuleControl_DataValid()
        {
            MarkerToGoalDistanceRule markerToGoalDistanceRule = (plRuleControl.Controls["ruleControl"] as MarkerToGoalDistanceRuleControl).MarkerToGoalDistanceRule;

            if (!lbRules.Items.Contains(markerToGoalDistanceRule))
            {
                lbRules.Items.Add(markerToGoalDistanceRule);
            }
            Log(LogSeverityType.Info, $"{markerToGoalDistanceRule} created/modified");
        }
 /// <summary>
 /// Constructor which pre-fills control from existing rule
 /// </summary>
 /// <param name="markerToGoalDistanceRule">the existing marker to goal distance rule</param>
 public MarkerToGoalDistanceRuleControl(MarkerToGoalDistanceRule markerToGoalDistanceRule)
 {
     MarkerToGoalDistanceRule = markerToGoalDistanceRule;
     InitializeComponent();
     Prefill();
 }